psychopathology
Another word for mental health could be psychological well-being.
One possible synonym for "mental case" is "psychological case."
hardy
The word psychological is the adjective form for the noun psychology.
In psychiatry, this is known as cycling. Rapid cycling can be a sign of psychological problems (such as Bipolar Disorder or Depression) and should be reviewed with a psychological/psychiatric professional.
extensors / extensor muscles
The word 'psychological' is the adjective form of the noun psychology.
'Injury' is defined as: NOUN 1) a condition resulting from an accident or violence that impairs the normal function of the living body and causes pain 2) any action deviating from law or morals that inflicts physical or psychological damage to another person or property
Not always, but often, interconnects, or another word for them, cables.
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The word you are looking for is "psychological."